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- Title
Temperature-dependent jumonji demethylase modulates flowering time by targeting H3K36me2/3 in Brassica rapa.
- Authors
Xin, Xiaoyun; Li, Peirong; Zhao, Xiuyun; Yu, Yangjun; Wang, Weihong; Jin, Guihua; Wang, Jiao; Sun, Liling; Zhang, Deshuang; Zhang, Fenglan; Yu, Shuancang; Su, Tongbing
- Abstract
Global warming has a severe impact on the flowering time and yield of crops. Histone modifications have been well-documented for their roles in enabling plant plasticity in ambient temperature. However, the factor modulating histone modifications and their involvement in habitat adaptation have remained elusive. In this study, through genome-wide pattern analysis and quantitative-trait-locus (QTL) mapping, we reveal that BrJMJ18 is a candidate gene for a QTL regulating thermotolerance in thermotolerant B. rapa subsp. chinensis var. parachinensis (or Caixin, abbreviated to Par). BrJMJ18 encodes an H3K36me2/3 Jumonji demethylase that remodels H3K36 methylation across the genome. We demonstrate that the BrJMJ18 allele from Par (BrJMJ18Par) influences flowering time and plant growth in a temperature-dependent manner via characterizing overexpression and CRISPR/Cas9 mutant plants. We further show that overexpression of BrJMJ18Par can modulate the expression of BrFLC3, one of the five BrFLC orthologs. Furthermore, ChIP-seq and transcriptome data reveal that BrJMJ18Par can regulate chlorophyll biosynthesis under high temperatures. We also demonstrate that three amino acid mutations may account for function differences in BrJMJ18 between subspecies. Based on these findings, we propose a working model in which an H3K36me2/3 demethylase, while not affecting agronomic traits under normal conditions, can enhance resilience under heat stress in Brassica rapa. The study reveals that the BrJMJ18 gene, encoding an H3K36me2/3 Jumonji demethylase, is a candidate gene for a QTL regulating thermotolerance in a thermotolerant Brassica rapa subspecies, and its allele (BrJMJ18Par) can modulate flowering time, plant growth, and chlorophyll biosynthesis in a temperature-dependent manner.
- Subjects
DEMETHYLASE; FLOWERING of plants; BRASSICA; FLOWERING time; THERMAL tolerance (Physiology); CROP yields; PLANT growth; BIOSYNTHESIS
- Publication
Nature Communications, 2024, Vol 15, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-024-49721-z